I really appreciate the work you have put into this. I particularly like threads and tags. A built-in spell-checker? Oh, there it is; perhaps widen the text box just a smidgen ;0)

A couple of navigation suggestions:

1. Put Enter the Fray as a main menu (left standard) item.
   
2. The Fray's breadcrumb menu should use Home as it's root to enable navigation back to Slate's Home Page.